During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"),
using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we have
identified a candidate nova in the disk of M31:

ASASSN-13cq was discovered in images obtained on UT Aug. 31.42, but is present in previous images on Aug. 30.15 (17.7 mag) and possibly on Aug. 29.19 (18.0 mag). No previous variability is recorded at this position by ASAS-SN. There are no known M31 variables in this location within 5". Mould et al. (2004) report a pulsating star close to this position (10" in SIMBAD), but its reported variability is too faint to explain the transient flux. This area of M31 has been subject to numerous variability studies.

This figure
shows ASAS-SN data from 2013 August 29, 30 and 31, along with the reference image and DSS image.
The inner circle has a 16" radius and is in the same position in each image.